{#--- Begin #}
  function {{struct.name}}(values) {
    this.initDefaults_();
    this.initFields_(values);
  }

{#--- Enums #}
{%- from "enum_definition.tmpl" import enum_def %}
{%  for enum in struct.enums %}
  {{enum_def("%s.%s"|format(struct.name, enum.name), enum)}}
{%-  endfor %}

{#--- Constants #}
{%  for constant in struct.constants %}
  {{struct.name}}.{{constant.name}} = {{constant.value|expression_to_text}};
{%-  endfor %}

{#--- initDefaults() #}
  {{struct.name}}.prototype.initDefaults_ = function() {
{%- for packed_field in struct.packed.packed_fields %}
    this.{{packed_field.field.name}} = {{packed_field.field|default_value}};
{%- endfor %}
  };

{#--- initFields() #}
  {{struct.name}}.prototype.initFields_ = function(fields) {
    for(var field in fields) {
        if (this.hasOwnProperty(field))
          this[field] = fields[field];
    }
  };

{#--- Fuzzing #}
{%- if generate_fuzzing %}
{%-   from "fuzzing.tmpl" import generate_or_mutate %}
  {{struct.name}}.generate = function(generator_) {
    var generated = new {{struct.name}};
{%-   for field in struct.fields %}
    generated.{{field.name}} = {{generate_or_mutate('generator_', 'generate', field.kind)|indent(4)}};
{%-   endfor %}
    return generated;
  };

  {{struct.name}}.prototype.mutate = function(mutator_) {
{%-   for field in struct.fields %}
    if (mutator_.chooseMutateField()) {
      this.{{field.name}} = {{generate_or_mutate('mutator_', 'mutate', field.kind, 'this.' ~ field.name)|indent(6)}};
    }
{%-   endfor %}
    return this;
  };

{%-   from "fuzzing.tmpl" import get_handle_deps %}
  {{struct.name}}.prototype.getHandleDeps = function() {
    var handles = [];
{%-   for field in struct.fields %}
{%-     if field.kind|contains_handles_or_interfaces %}
    if (this.{{field.name}} !== null) {
      Array.prototype.push.apply(handles, {{get_handle_deps(field.kind, 'this.' ~ field.name)|indent(6)}});
    }
{%-     endif %}
{%-   endfor %}
    return handles;
  };

  {{struct.name}}.prototype.setHandles = function() {
    this.setHandlesInternal_(arguments, 0);
  };

{%-   from "fuzzing.tmpl" import set_handles %}
  {{struct.name}}.prototype.setHandlesInternal_ = function(handles, idx) {
{%-   for field in struct.fields %}
{%-     if field.kind|contains_handles_or_interfaces %}
    {{set_handles(field.kind, 'this.' ~ field.name)|indent(4)}};
{%-     endif %}
{%-   endfor %}
    return idx;
  };
{%- endif %}

{#--- Validation #}

  {{struct.name}}.validate = function(messageValidator, offset) {
    var err;
    err = messageValidator.validateStructHeader(offset, codec.kStructHeaderSize);
    if (err !== validator.validationError.NONE)
        return err;

    var kVersionSizes = [
{%- for version in struct.versions %}
      {version: {{version.version}}, numBytes: {{version.num_bytes}}}{% if not loop.last %},
      {%- endif -%}
{%  endfor %}
    ];
    err = messageValidator.validateStructVersion(offset, kVersionSizes);
    if (err !== validator.validationError.NONE)
        return err;

{#- Before validating fields introduced at a certain version, we need to add
    a version check, which makes sure we skip further validation if |object|
    is from an earlier version. |last_checked_version| records the last
    version that we have added such version check. #}
{%- from "validation_macros.tmpl" import validate_struct_field %}
{%- set last_checked_version = 0 %}
{%- for packed_field in struct.packed.packed_fields_in_ordinal_order %}
{%-   set offset = packed_field|field_offset %}
{%-   set field = packed_field.field %}
{%-   set name = struct.name ~ '.' ~ field.name %}
{%    if field.kind|is_object_kind or
         field.kind|is_any_handle_or_interface_kind or
         field.kind|is_enum_kind %}
{%      if packed_field.min_version > last_checked_version %}
{%        set last_checked_version = packed_field.min_version %}
    // version check {{name}}
    if (!messageValidator.isFieldInStructVersion(offset, {{packed_field.min_version}}))
      return validator.validationError.NONE;
{%-     endif -%}
{{validate_struct_field(field, offset, name)|indent(4)}}
{%-   endif %}
{%- endfor %}

    return validator.validationError.NONE;
  };

{#--- Encoding and decoding #}

  {{struct.name}}.encodedSize = codec.kStructHeaderSize + {{struct.packed|payload_size}};

  {{struct.name}}.decode = function(decoder) {
    var packed;
    var val = new {{struct.name}}();
    var numberOfBytes = decoder.readUint32();
    var version = decoder.readUint32();
{%- for byte in struct.bytes %}
{%-   if byte.packed_fields|length >= 1 and
         byte.packed_fields[0].field.kind|is_bool_kind %}
    packed = decoder.readUint8();
{%-     for packed_field in byte.packed_fields %}
    val.{{packed_field.field.name}} = (packed >> {{packed_field.bit}}) & 1 ? true : false;
{%-     endfor %}
{%-   else %}
{%-     for packed_field in byte.packed_fields %}
    val.{{packed_field.field.name}} = decoder.{{packed_field.field.kind|decode_snippet}};
{%-     endfor %}
{%-   endif %}
{%-   if byte.is_padding %}
    decoder.skip(1);
{%-   endif %}
{%- endfor %}
    return val;
  };

  {{struct.name}}.encode = function(encoder, val) {
    var packed;
    encoder.writeUint32({{struct.name}}.encodedSize);
    encoder.writeUint32({{struct.versions[-1].version}});

{%- for byte in struct.bytes %}
{%-   if byte.packed_fields|length >= 1 and
         byte.packed_fields[0].field.kind|is_bool_kind %}
    packed = 0;
{%-     for packed_field in byte.packed_fields %}
    packed |= (val.{{packed_field.field.name}} & 1) << {{packed_field.bit}}
{%-     endfor %}
    encoder.writeUint8(packed);
{%-   else %}
{%-     for packed_field in byte.packed_fields %}
    encoder.{{packed_field.field.kind|encode_snippet}}val.{{packed_field.field.name}});
{%-     endfor %}
{%-   endif %}
{%-   if byte.is_padding %}
    encoder.skip(1);
{%-   endif %}
{%- endfor %}
  };